The earth is the abode of mankind. Infinite space surrounds the earth. The sun is at the center of the solar system. There are many such stars in space. Besides, there are moon (satellite), earth (planet), comet, meteor, nebula etc. From tiny insects and dust to our earth, the universe is all about the stars in the distance and everything unseen.
Space
and universe
The
sun is a star and the moon is a satellite. There is no beginning and no end to
this sky. This beginning-endless sky is called space. There are countless stars
in space. They are orbiting at a certain speed in their own orbits. Some of
them are in the corner of the corner and some of the corners are not in the
corner. There are moons, suns, planets, stars, comets, meteors, nebulae,
pulsars, black dwarfs, black holes, etc. in space. The universe is made up of
all of them. No one knows how big the universe is. No one knows the size or
shape of the universe; many scientists think that the universe has no beginning
and no end. Again, some still believe the universe has size and shape. People
are constantly discovering new information about the universe, much of which is
still unknown. This unknown may last forever.
Stars
The
astrologers who have their own orbit are called stars. There are innumerable
stars in space. With the naked eye we can see only a few thousand stars. Some
of these can be seen from Earth with the help of powerful telescopes. The
galaxies in the stars are made of gas, they are made of hydrogen and helium
gas. This gas
is burning at a very high temperature (about 6000 ° Celsius). No other stars
are seen during the day due to the brightness of the sun.
Seen
from the earth, it seems that the stars are in the same plane. But they are at different
distances from the earth. Between the earth and the stars and the stars the
distance between each other is so great. This distance cannot be expressed in
kilometers. This distance is measured in light years. Light travels about 3
lakh kilometers per second. The distance
that light travels at this speed in a year is called a light year. The sun is
the closest star to the earth. It takes 8 minutes and 19 seconds for light to
come from the sun to the earth. The nearest star to the Sun is Proxima
Centauri. Its distance from the Earth is about 4.2 light years.
Constellation
Looking
at the sky on a cloudless dark night, it seems that a few stars have formed an
alliance in a special shape. Thus, the constellations in our familiar shape are
called constellations. In ancient times, astronomers named different
constellations by imagining different shapes by connecting them with imaginary
lines.
According
to the bear, some of them look like predators. These include the Great Bear,
Orion, Cassiopeia, Little Bear, and Canis Major.
Galaxy
A huge collection of planets, stars, dust, comets, and bumps in
space is called a galaxy. There are hundreds of billions of galaxies in space.
They come in a variety of shapes and sizes, but most are spiral or elliptical.
Spiral galaxies are larger in size and elliptical galaxies are brighter. They
are located at great distances from each other. A small part of a galaxy is
called a galaxy.
Nebulae
The nebula is the lining of countless dim stars in space. Their
size is varied. The bodies of some nebulae are full of gaseous matter. These
are called gaseous nebulae. The distance between one nebula is one. One nebula
could contain billions of stars. Since they are billions of light-years from
Earth, the stars in them cannot be identified.
Milky
Way
A small part of a galaxy is called a galaxy or a galaxy. Their
bright glow in the dark sky looks like a long way. A galaxy is the sum of
billions of stars. If you look at the clear night sky in winter, you can see a
long line of bright light with a wide range in the north-south. The galaxy is
the path of this star-studded light. Scientists believe it to be a huge
circular sphere. The solar system belongs to such a galaxy.
Meteor
Many times, in the cloudless sky of the night, it seems as if
the stars are running or the stars are just falling in the corners. This
phenomenon is called stellar fall. But they are not actually starring in the
corner, their name is meteor. Innumerable inanimate objects float in space. These
inertias gravitate toward the earth at a tremendous speed (about 3 kilometers
per second). Comes. When they come in contact with air, they ignite as a result
of friction with air. As a result, they seem to be running away. Most
meteorites are quite small in size.
Planet
In
space, some astronomical orbits the sun at certain times. They do not have
light or heat in their own corners. Under the influence of the gravitational
ball, they revolve around the Sun. They receive light and heat from the Sun.
This heat is heated. They do not flicker like stars. These luminaries are
called planets. The eight planets in our solar system are Mercury, Venus,
Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Satellite
Some astronomical planets revolve around planets or moons. Under
the influence of the gravitational ball, they circle the center of the planet.
They do not have their own light or heat. They receive light or heat from the
sun or stars. The moon is the only satellite of the planet Earth. Some planets
have satellites, some do not. Mercury and Venus have no satellites. New
satellites are being discovered with the advancement of science.
Author-m.zaman(rasel)
The Universe and Our Earth){kind=link}
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